Rubber tire



M. R. SHAW RUBBER TIRE Filed Oct. 26 1920 :1: are substantially improved I m pile up at this point. Considerabletrou.

Patented Get. 16,1923;

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or Unicorns "lentils, nrs'isseciinsnrrs n 'eonroiaer on RUBBER. TIRE.

as? EMA-diarIsK- RUBBER 0 He se.

. AppIiGatiOn aieectober 2s, 132,0. Serial n f aiasia' i Total l who it ma cohcem [citizen of'the United States ofAn1'erica5 -re5 siding at Springfield; in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in a RubberTire, lowing is a specification' solid or cushion type,

wearing qualities and tractiveeii'ectiveness The most generally cross-section which for the [most part; have except that which is vdue to-the naturalresiliencylcf therubber itself. lthas been proposed. to increase 1 the resiliency of these tires and to break up wh'at isknownaslthe traction wave by proi idingf either straight: recesses cut in the, side or cylindrical holes e located "at an angleto the radius ofathe tire.:.- A By the term traction wave it will; be, understood that I; refer to the wave ofconipression of the rnbberWhich is set up' just ahead of the line. ofcontactf of the tirewith the ground, the rubber having atendency me has been experienced with. tires built with stralght' recesses largely on account of excessive wear on the rubber 'adjacentftho recesses. This is due to; the, fact that} a straight recess 'ineets and leaves the road instantaneously throi'ighout its whole length.

As the rubber is under compression when in contact with the road there lsa considerable snap when it is released "by the recess coming into position which causes greatlyink creased friction and wear in thetire." Furthermore f a suflici'ent number-for stralght" recesses are provided to breakup the tracwear and tractive efi'ectiveness;

tion wave the tire is weakened and isunable to stand road conditions without'exc'essive The cylindrical holes; which have been proposed soon become useless onac count oftheir collecting dirt andstones.

By my improved construction I thesedifficulties and provide a tire having greatly improved qualities .of resiliency,

y invention can best be appreciated when consideredin connection'withits illusof whi h as ra t re is, H I p I slightly, rounded satisfactorysolid tires f have been thoseof substantially trapezoidal f- Of course,

stones and dirt.

on the two 'sides of within the middle into three parts of avoid tration in theaccoinpanying drawingslgin Be it known that I, MYRON R. .SHAw,a- 7

which H l'is portionofniyirnproved'tire;.

Fig.2 and v F i'g.-3 is a section onlineB-B of Fig.1

. e The tire is formed or La rubber body lfi My invention relates-t0 rubberitiresofthe and has for its'fobjeetg a tire of this type in whichthe resiliency,

mounted any'suitable wayon .a metal base 11', as by a layerof'hardrubber; cent the metal, "The tread portion 120i the preferablyYsubstantially; fiat but asat 13 at'its edges. Be

cesses .or grooves 14 are formed-- the sides tire, being preferably, arranged 0b.

liquely to thegcentrallineior planefof the t'ire, and being preferably rounded in crossiisfa section on; line of Fig.1;

tennis fffraginentaryplanof the 'adja V section at their bottom as at 15and curved in longitudinal section as atl6 so thatab-- V I rupt;'cornersareavoided and the grooves,

will have aglcontourtending to; free: them of i "This action will be aided by the oblique. arrangement or the grooves,

the "progressive and 1 consequent narrowing .of the grooves forcingout any foreign matter such as dirt,

compression of the rubber I and'the widening of the groo'ves afterthe compressionis ,remove'dreleasing stones or the likewhichhave been picked up. These recesses are preferably arranged alternately the tire, so. as not to remove a largevolume of rubber" at anyone I line of cross-section, and extend to substan tially;the icenter] of the the from points part way down the sides; Betweenthe re cesses leare recesses or depressions. 17. con-e fined within the tread portion i'a'nd preferably substantiallyvirusto-conical in form; These latter recesses are non-centrally of the tread, so that they break up the rubber volume. in the roughly diamond-shaped portion of the tire between the recesses 14. Both sets of recesses are,

preferably arranged to extend ;a niaterial' distance into the tire, "preferably to a depth third of the tire. In

preferably disposedf I other words, considering the section as shown in Fig. 2 divided by horizontal lines equal depth, the recesses are preferably ofsucha depthas to extend operation over tiresnowfin use; 'For"ex i approximately within the central one of the ample the oblique. direction of the recesses l l gives a much better actionon the road than is the case with recesses set at right. an gles to thev center line of the tire, due to i the contact of the recess with the road being gradual andprogressive insteadot sudden as is the case with tires having straight, re-V cesses, as described above. The conical holes serve to break up the continuity or the rubber between the siderecesses; and provide space for the compression'ofthe rubber. I Due to-their conical shape they act to expel any stones or dirt that may be-pi clted up the collection of which "forms a troublesome fea 'ture of tires having cylindrical holes. The

depth of the two sets of recesses both serves to aid insupplyin'g a uniform heat to'the whole volume of the tire in vulcanization and to ventilate the base ofthe tire when in road use, thus avoiding overheating of the tire at this POllllLy l By the construction above described a tire is provided having a substantially flat tread recesses therein so disposed as portion with to provide ample breaking u otthe flowtag'eof the rubber in all directions, and at the sametime without weakening' the tire or claim r r 1. A solid rubbertirehaving' a resilient body portion,'recesses oblique to the plane of the tire and arranged on oppositesides 7 thereof, and substantially conical recesses stantially trapezoidal cross-section, re

disposed non c'entrally of the tread portion of the tire and between the firstnamed recesses; the said recesses extending to a depth approximately within the iniddlethird of -thetire.

solid rubber tire having an annular body-portion of resilient material of subcesses oblique to the plane of the annulus of the tire. I

and extending alternately trom the sides of the tire to substantially the center of the tread, and substantially conical recesses disposed to break the continuity of the surface between adjacent recesses on the sameside ot the tire, the said recesses extending to a ide-pth approximately ;within the middle third of the tire. 7

8. A solid rubber 'tire having an annular body portion or resilient material recesses' extending alternately into thetread-portio'n of the tire nombpponte sides of the tire,

and additional recesses confined within the" tread portion and'arranged to break the continuity of'the tread surface between ad-' jaeent side re'c esses,;the said recesses extend-i ithin the 1 ing' toja depth approximately w' 'middle third of the'tire.

4t. Aasolid rubber tire having an annular body portion of resilient material forming a 'enerall i'iat treadsurtace rooves extenda .7 i h t ing 1nto the outer surface of the annulus from opposite sides thereof; and substantially conical depressions disposed noncentrally' ot' the annulus and located between the grooves, the said grooves and depressions extendingto a-depth approximatelywithin.

the middle third or" the tire.

5. A solid "rubber tirehaving a substan tially trapezoidal cross-section andpresenting" a" tread surfacewhich is" substantially fiat but having rounded corners, grooves extending from the sides of-the tire to sub-' stantially the centerof the tread, said. grooves being disposed obliquely to the center line of the tread and being curved in longitudinal section and rounded in cross-- section at their bottoms,; said grooves also being arrangedalternately on opposite sides of the tire, and: depressions substantially frusto-conical in form located non-centrally of I the tread portion between adjacent grooves on the same side of the tire, the said grooves and depressions extending to a depth approximately within the middle third MYRON R. SHAW. 

